1b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//===- Mutex.cpp - Mutual Exclusion Lock ------------------------*- C++ -*-===// 2b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// 3b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// The LLVM Compiler Infrastructure 4b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// 8b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//===----------------------------------------------------------------------===// 9b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// 10b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// This file implements the llvm::sys::Mutex class. 11b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// 12b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//===----------------------------------------------------------------------===// 13b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 14b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#include "llvm/Config/config.h" 151f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "llvm/Support/Mutex.h" 16b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 17b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//===----------------------------------------------------------------------===// 18b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//=== WARNING: Implementation here must contain only TRULY operating system 19b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//=== independent code. 20b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer//===----------------------------------------------------------------------===// 21b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 2208b73a30bbb6407c7b48a734a29f65f4c8ddd782Dylan Noblesmith#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0 230a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer// Define all methods as no-ops if threading is explicitly disabled 246d2352249af8853c8307a7cf679017b32d27958cJeff Cohennamespace llvm { 256d2352249af8853c8307a7cf679017b32d27958cJeff Cohenusing namespace sys; 26b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::MutexImpl( bool recursive) { } 27b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::~MutexImpl() { } 28b849a4dd4bee9ad17e295691087ce09e8d77d685Owen Andersonbool MutexImpl::acquire() { return true; } 29b849a4dd4bee9ad17e295691087ce09e8d77d685Owen Andersonbool MutexImpl::release() { return true; } 30b849a4dd4bee9ad17e295691087ce09e8d77d685Owen Andersonbool MutexImpl::tryacquire() { return true; } 310a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer} 320a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer#else 330a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer 340a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK) 356d2352249af8853c8307a7cf679017b32d27958cJeff Cohen 36b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#include <cassert> 37b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#include <pthread.h> 38b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#include <stdlib.h> 39b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 400a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencernamespace llvm { 410a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencerusing namespace sys; 420a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer 43b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// Construct a Mutex using pthread calls 44b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::MutexImpl( bool recursive) 45b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer : data_(0) 46b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer{ 4749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Declare the pthread_mutex data structures 4849c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_t* mutex = 4949c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie static_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t))); 5049c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutexattr_t attr; 5149c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie 5249c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Initialize the mutex attributes 5349c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie int errorcode = pthread_mutexattr_init(&attr); 545b8a1db7ea6510a2589f710d50754599da742de9Duncan Sands assert(errorcode == 0); (void)errorcode; 5549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie 5649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Initialize the mutex as a recursive mutex, if requested, or normal 5749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // otherwise. 5849c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie int kind = ( recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL ); 5949c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie errorcode = pthread_mutexattr_settype(&attr, kind); 6049c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(errorcode == 0); 61b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 62b0f6759ab93b42570d71665b13d24ca2c4a5f276Eric Christopher#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && \ 63b0f6759ab93b42570d71665b13d24ca2c4a5f276Eric Christopher !defined(__DragonFly__) && !defined(__Bitrig__) 6449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Make it a process local mutex 6549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie errorcode = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE); 6649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(errorcode == 0); 672499841461a95872a9fe15d310f1d71f94af76d9Reid Spencer#endif 68b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 6949c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Initialize the mutex 7049c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie errorcode = pthread_mutex_init(mutex, &attr); 7149c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(errorcode == 0); 72b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 7349c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Destroy the attributes 7449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie errorcode = pthread_mutexattr_destroy(&attr); 7549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(errorcode == 0); 76b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 7749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie // Assign the data member 7849c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie data_ = mutex; 79b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 80b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 81b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer// Destruct a Mutex 82b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::~MutexImpl() 83b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer{ 8449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_); 8549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(mutex != 0); 8649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_destroy(mutex); 8749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie free(mutex); 88b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 89b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 9000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohenbool 91b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::acquire() 92b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer{ 9349c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_); 9449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(mutex != 0); 9549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie 9649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie int errorcode = pthread_mutex_lock(mutex); 9749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie return errorcode == 0; 98b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 99b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 10000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohenbool 101b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::release() 102b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer{ 10349c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_); 10449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(mutex != 0); 10549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie 10649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie int errorcode = pthread_mutex_unlock(mutex); 10749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie return errorcode == 0; 108b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 109b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 11000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohenbool 111b849a4dd4bee9ad17e295691087ce09e8d77d685Owen AndersonMutexImpl::tryacquire() 112b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer{ 11349c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_); 11449c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie assert(mutex != 0); 11549c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie 11649c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie int errorcode = pthread_mutex_trylock(mutex); 11749c0a9ac989848844f0eb8894ef7ae6b8dde3495David Blaikie return errorcode == 0; 118b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 119b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer 120b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer} 1216d2352249af8853c8307a7cf679017b32d27958cJeff Cohen 122b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#elif defined(LLVM_ON_UNIX) 123b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#include "Unix/Mutex.inc" 124b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#elif defined( LLVM_ON_WIN32) 1251f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "Windows/Mutex.inc" 126b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#else 1272c607b665dbeb52e2ade86f0e1f191695290da3bDaniel Dunbar#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in Support/Mutex.cpp 128b2164e5cb5086f0595e96fdbb5ffc614dea9c441Reid Spencer#endif 1290a262ba7c3250ef02833fae864459ccc905a2e9bReid Spencer#endif 130